<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #d1{
      width: 100px;
      height: 100px;
      border: 1px solid red;
/*      margin-top:100px ;
      margin-left: 50px;
      margin-bottom: 50px;
      margin-right: 50px;*/
        /*四个方向*/
        margin: 50px;
        /*居中*/
        margin: 0 auto;
        /*上下和左右*/
        margin: 50px 100px;
        /*上右下左 顺时针*/
        margin: 10px 20px 30px 40px;
    }
    #d2{
      width: 100px;
      height: 100px;
      border: 1px solid blue;
        margin-top:40px;
    }
    #sp1{
        margin-right: 50px;
    }
    #sp2{
        margin-left: 50px;
    }
    #big{
        width: 200px;
        height: 200px;
        background-color: green;
        overflow: hidden;
    }
    #big>div{
        width: 50px;
        height: 50px;
        background-color: purple;
        margin-top: 50px;
        margin-left: 50px;
    }
  </style>
</head>
<body>
<div id="big">
    <div></div>
</div>
<span id="sp1">span1</span>
<span id="sp2">span2</span>
<div id = "d1"></div>
<div id = "d2"></div>

</body>
</html>